D3 Examples - 3.8 color scales

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<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
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<!-- Google fonts reference-->
<link href="https://fonts.googleapis.com/css2?family=Montserrat+Alternates:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto:ital,wght@0,100;0,300;1,100;1,300&display=swap" rel="stylesheet">
​
<!-- Connecting with D3 library-->
<script src="https://d3js.org/d3.v4.min.js" charset="utf-8"></script>
​
<style>
​
/*Defining text stylings*/
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#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:300;
}
​
#link {
    font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
    margin:5px 0px 0px 22px;
  color:white;
}
​
a:link, a:visited, a:active {
    text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}
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body {
  background-color:#011227;
}
​
/*Defining button stylings*/
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button {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:100;
  font-size:15px;
  margin:30px 0px 0px 50px;
  color:white;
  border:0;
  line-height:1.5;
  text-align:left;
  border-radius:1px;
  background-color:#011227;
}
​
button:hover {
  color:#f5fa91;
  background-color:#011227;
  font-weight:500;
}
​
</style>
</head>
​
<body>
   
<!-- Creating the headlines -->
<p id="h1">COLOUR SCALE</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>
  
<!-- Creating a div for the buttons -->
<div class="Buttons"></div> 
  
<script>
​
//Margin conventions
var m = {top:20, right:20, bottom:20, left:40}
    w = 800 - m.left - m.right,
    h = 800 - m.top - m.bottom;
​
//Container
var svg = d3.select("body")
    .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
        .attr("transform", `translate(${m.left}, ${m.top})`);
​
//Color scale
var c = d3.scaleLinear()
    .domain([0, w])
    .range(["#f5fa91", "#8ff798"]);
​
//Creating the bars
svg.selectAll(".bars")
    .data(d3.range(w), d => d)
    .enter()
    .append("rect")
    .attr("class", "bars")
    .attr("x", (d,i) => i)
    .attr("y", 0)
    .attr("height", 300)
    .attr("width", 2)
    .style("fill", (d,i) => c(d))
​
//Saving all scale names in a variable
var cscales = [
    "Cool",
    "Virdis",
    "Inferno",
    "Magma",
    "Plasma",
    "Warm",
    "Rainbow"
];
​
//Creating the buttons
d3.select(".Buttons")
    .selectAll("button")
    .data(cscales)
    .enter()
    .append("button")
    .text(d => d)
    .on("click", function(buttonValue) {
​
                  //New color scale
                  var cnew = d3.scaleSequential(d3["interpolate" + buttonValue])
                      .domain([0, w]);
​
                  //Animation to change to the new color scale
                  svg.selectAll(".bars")
                      .transition()
                      .duration(3000)
                      .style("fill",d => cnew(d));
​
});
​
</script>
</body>
</html>
​
    